package agent import ( "fmt" "github.com/hashicorp/consul/consul" "github.com/hashicorp/consul/consul/structs" "net/http" "strings" "time" ) const ( // lockDelayMinThreshold is used to convert a numeric lock // delay value from nanoseconds to seconds if it is below this // threshold. Users often send a value like 5, which they assume // is seconds, but because Go uses nanosecond granularity, ends // up being very small. If we see a value below this threshold, // we multply by time.Second lockDelayMinThreshold = 1000 ) // sessionCreateResponse is used to wrap the session ID type sessionCreateResponse struct { ID string } // SessionCreate is used to create a new session func (s *HTTPServer) SessionCreate(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Mandate a PUT request if req.Method != "PUT" { resp.WriteHeader(405) return nil, nil } // Default the session to our node + serf check + release session invalidate behavior args := structs.SessionRequest{ Op: structs.SessionCreate, Session: structs.Session{ Node: s.agent.config.NodeName, Checks: []string{consul.SerfCheckID}, LockDelay: 15 * time.Second, Behavior: structs.SessionKeysRelease, TTL: "", }, } s.parseDC(req, &args.Datacenter) // Handle optional request body if req.ContentLength > 0 { if err := decodeBody(req, &args.Session, FixupLockDelay); err != nil { resp.WriteHeader(400) resp.Write([]byte(fmt.Sprintf("Request decode failed: %v", err))) return nil, nil } } // Create the session, get the ID var out string if err := s.agent.RPC("Session.Apply", &args, &out); err != nil { return nil, err } // Format the response as a JSON object return sessionCreateResponse{out}, nil } // FixupLockDelay is used to handle parsing the JSON body to session/create // and properly parsing out the lock delay duration value. func FixupLockDelay(raw interface{}) error { rawMap, ok := raw.(map[string]interface{}) if !ok { return nil } var key string for k, _ := range rawMap { if strings.ToLower(k) == "lockdelay" { key = k break } } if key != "" { val := rawMap[key] // Convert a string value into an integer if vStr, ok := val.(string); ok { dur, err := time.ParseDuration(vStr) if err != nil { return err } if dur < lockDelayMinThreshold { dur = dur * time.Second } rawMap[key] = dur } // Convert low value integers into seconds if vNum, ok := val.(float64); ok { dur := time.Duration(vNum) if dur < lockDelayMinThreshold { dur = dur * time.Second } rawMap[key] = dur } } return nil } // SessionDestroy is used to destroy an existing session func (s *HTTPServer) SessionDestroy(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Mandate a PUT request if req.Method != "PUT" { resp.WriteHeader(405) return nil, nil } args := structs.SessionRequest{ Op: structs.SessionDestroy, } s.parseDC(req, &args.Datacenter) // Pull out the session id args.Session.ID = strings.TrimPrefix(req.URL.Path, "/v1/session/destroy/") if args.Session.ID == "" { resp.WriteHeader(400) resp.Write([]byte("Missing session")) return nil, nil } var out string if err := s.agent.RPC("Session.Apply", &args, &out); err != nil { return nil, err } return true, nil } // SessionRenew is used to renew the TTL on an existing TTL session func (s *HTTPServer) SessionRenew(resp http.ResponseWriter, req *http.Request) (interface{}, error) { // Mandate a PUT request if req.Method != "PUT" { resp.WriteHeader(405) return nil, nil } args := structs.SessionSpecificRequest{} if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } // Pull out the session id args.Session = strings.TrimPrefix(req.URL.Path, "/v1/session/renew/") if args.Session == "" { resp.WriteHeader(400) resp.Write([]byte("Missing session")) return nil, nil } var out structs.IndexedSessions defer setMeta(resp, &out.QueryMeta) if err := s.agent.RPC("Session.Renew", &args, &out); err != nil { return nil, err } else if out.Sessions == nil { resp.WriteHeader(404) resp.Write([]byte(fmt.Sprintf("Session id '%s' not found", args.Session))) return nil, nil } return out.Sessions, nil } // SessionGet is used to get info for a particular session func (s *HTTPServer) SessionGet(resp http.ResponseWriter, req *http.Request) (interface{}, error) { args := structs.SessionSpecificRequest{} if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } // Pull out the session id args.Session = strings.TrimPrefix(req.URL.Path, "/v1/session/info/") if args.Session == "" { resp.WriteHeader(400) resp.Write([]byte("Missing session")) return nil, nil } var out structs.IndexedSessions defer setMeta(resp, &out.QueryMeta) if err := s.agent.RPC("Session.Get", &args, &out); err != nil { return nil, err } return out.Sessions, nil } // SessionList is used to list all the sessions func (s *HTTPServer) SessionList(resp http.ResponseWriter, req *http.Request) (interface{}, error) { args := structs.DCSpecificRequest{} if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } var out structs.IndexedSessions defer setMeta(resp, &out.QueryMeta) if err := s.agent.RPC("Session.List", &args, &out); err != nil { return nil, err } return out.Sessions, nil } // SessionsForNode returns all the nodes belonging to a node func (s *HTTPServer) SessionsForNode(resp http.ResponseWriter, req *http.Request) (interface{}, error) { args := structs.NodeSpecificRequest{} if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done { return nil, nil } // Pull out the node name args.Node = strings.TrimPrefix(req.URL.Path, "/v1/session/node/") if args.Node == "" { resp.WriteHeader(400) resp.Write([]byte("Missing node name")) return nil, nil } var out structs.IndexedSessions defer setMeta(resp, &out.QueryMeta) if err := s.agent.RPC("Session.NodeSessions", &args, &out); err != nil { return nil, err } return out.Sessions, nil }